Thursday, October 3, 2019

Quantum computing


The performance of D-Wave, which was the topic of the world's first quantum computer, is not so different from ordinary computers. Some even say that D-Wave is not a proper quantum computer. In fact, D-Wave didn't do much for the title of the first quantum computer. While quantum computers solve NP problems easily, the story of when proper algorithms have been applied, D-Wave, has so far been sold only to Lockheed Martin, NASA, and Google, and hasn't shown any special performance. It may still take some time to play the role of tumbling expectations, and many media have reported since 2013 that quantum computers will be used at a practical level. In the last two years, public information on quantum computers has also increased significantly.quantum computers will be used at a practical level. In the last two years, public information on quantum computers has also increased significantly.

Will quantum computers be realized sooner or later as media and people expect? Most experts agree that it's a long way off. That would be quite different from what people expect. At the current level of technology, quantum computers will not be able to play games, put business programs, or even popular operating systems like Windows or Linux. This is because the quantum computers that are currently being studied are computers that can be used for a limited purpose.

Classic computers produce only one result for an input. It is a deterministic system in which the output value is determined linearly according to the input value. In contrast, quantum computers using quantum-level elementary particles make use of particle nesting. The superposition of states refers to the appearance of several states at the same time on a particle, and is often associated with the 'uncertainty' of both.

For example, suppose a quantum computer uses the spin of electrons as qubits. The electron before starting the operation has both +1/2 and -1/2, the values ​​of the spin the electron can have in a quantum computer. This is roughly described as follows. Think of it as a white ball for a question or a black ball for a question.

 


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